LibJS: Convert Heap::allocate{,_without_realm}() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 22089436ed
Pull-request: https://github.com/SerenityOS/serenity/pull/16498
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp

@@ -20,7 +20,7 @@ namespace Web::DOM {
 JS::NonnullGCPtr<DOMImplementation> DOMImplementation::create(Document& document)
 {
     auto& realm = document.realm();
-    return *realm.heap().allocate<DOMImplementation>(realm, document);
+    return realm.heap().allocate<DOMImplementation>(realm, document);
 }
 
 DOMImplementation::DOMImplementation(Document& document)